This is a 4-piece set to improve common harmonica problems. * Sluggish slide lever * Valve noise * Reed clogging 4-Piece Set Contents: 1. Harmonica Slide Oil This is a special oil to keep the slide of a chromatic harmonica in good condition. Applying a thin layer to both sides of the slide and the spring holes will provide smooth movement. It is made from non-toxic ingredients. 2. Valve Repair Tool Many people have experienced sound clogging because the two-layered valve tends to stick together due to condensation. Carefully peeling them apart can be difficult, and the valve can break. The solution is to gently insert and remove a 0.02mm shim tape. This 0.02mm shim tape is also very useful for filing and removing debris. It passes through the gap between the reed and the hole, removing foreign objects and eliminating the cause of sound clogging. 3. Reed Adjustment Tool At first glance, it looks like just a pair of tweezers, but one side is processed to be thin enough to go under the reed. This is a homemade tool from a harmonica workshop that is used every day. The gripping part can hold the reed, allowing for stable reed adjustment. The feel of blowing and drawing changes greatly depending on the height of the reed. It's also fun to set and explore the reed height to match your own feel. 4. Cloth Reed adjustment is explained in the separately sold custom harp workshop video.